论文部分内容阅读
基于桩-土相互作用中地基土的离散模型和有限元模型,采用空间S-R模型和整体有限元法分别建立桩-土-单层柱面网壳结构相互作用的简化模型和一体化模型,简化模型中将地基土以离散的弹簧单元模拟,通过与一体化模型的对比分析,探究空间S-R模型分析桩-土-结构相互作用下大跨空间结构的适用性和精确度。研究表明:采用空间S-R模型建立的简化模型能够较好地模拟网壳结构自振特性和网壳屋盖地震响应,便于工程应用。简化模型得到的网壳屋盖第一阶自振频率与一体化模型的计算误差在10%之内,在不同地震作用下,简化模型得到的网壳屋盖节点加速度峰值与一体化模型结果的最大误差为13.05%,位移最大值的最大误差为7.20%,杆件内力最大误差为9.59%。
Based on the discrete model and finite element model of soil in pile-soil interaction, a simplified model and an integrated model of pile-soil-single-layer cylindrical reticulated shell interaction are established using the spatial SR model and the integral finite element method. In the model, the foundation soil is simulated by discrete spring elements. Through comparative analysis with the integrated model, the space SR model is used to analyze the applicability and accuracy of the long-span space structure under pile-soil-structure interaction. The research shows that the simplified model established by the spatial S-R model can simulate the natural vibration characteristics of the shell structure and the seismic response of the roof of the shell, which is convenient for engineering application. The calculation error of the first-order natural vibration frequency of the shell roof obtained by the simplified model and the integrated model is within 10%. Under the effect of different earthquakes, the acceleration peak value of the shell roof node obtained by the simplified model and the integrated model result are obtained. The maximum error is 13.05%, the maximum error of the displacement maximum is 7.20%, and the maximum error of the internal force of the rod is 9.59%.